Alignment and scattering of colliding active droplets.
Alignment and scattering of colliding active droplets.
复制标题
碰撞活性液滴的对齐和散射。
作者：
K. Lippera;M. Benzaquen;S. Michelin
活性液滴在其表面释放化学溶质，改变其局部界面张力。他们利用溶质的对流输运的非线性耦合产生的马兰戈尼流，以自我推进。这种游泳液滴本质上是抗趋化性的，并且被它们自己的化学尾迹或它们的邻居排斥。反弹动力学导致成对液滴相互作用最近进行了详细分析，纯粹的头上碰撞使用一个特定的双球面的方法。在这里，我们扩展了这种分析，并提出了一个简化的模型，一个通用的碰撞来验证倾斜液滴碰撞的对齐和散射特性及其对集体液滴动力学的潜在影响。当液滴直接相互作用时，对于对称碰撞观察到液滴的轨迹的系统对准，并且在碰撞期间液滴的化学尾流的有限时间重排引起。对于更一般的碰撞，观察到复杂和多样的动力学制度，无论是液滴直接相互作用或通过其化学尾流，导致显着的散射。
Active droplets emit a chemical solute at their surface that modifies their local interfacial tension. They exploit the nonlinear coupling of the convective transport of solute to the resulting Marangoni flows in order to self-propel. Such swimming droplets are by nature anti-chemotactic and are repelled by their own chemical wake or their neighbours. The rebound dynamics resulting from pairwise droplet interactions was recently analysed in detail for purely head-on collisions using a specific bispherical approach. Here, we extend this analysis and propose a reduced model of a generic collision to characterise the alignment and scattering properties of oblique droplet collisions and their potential impact on collective droplet dynamics. A systematic alignment of the droplets' trajectories is observed for symmetric collisions, when the droplets interact directly, and arises from the finite-time rearrangement of the droplets' chemical wake during the collision. For more generic collisions, complex and diverse dynamical regimes are observed, whether the droplets interact directly or through their chemical wake, resulting in a significant scattering.
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影响因子：
44.1
作者：
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